{"id":"47aab078-904c-4f7c-b6b4-eae930349b7e","shortId":"6SGnVY","kind":"x402","title":"x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific portfolio resource (ID 89) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/portfolios/89` is listed under \"Premium API Access\" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 given USDC's 6 decimal places. There are no API keys required, no rate limits advertised, and access is instant once payment is included in the X-PAYMENT header. The x402 challenge (version 1, scheme \"exact\") was confirmed live during probing.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolio resource actually contains or what fields the POST body expects. The endpoint is confirmed live and correctly returning a 402 challenge, but without documentation it is unclear what data is returned or what input is required beyond the payment header.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","portfolio-data","post-endpoint"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium data access"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request body or response format for this endpoint.","The nature of the 'portfolio' data returned is completely undocumented.","No request or response examples are available from any source."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/89","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/portfolios/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the portfolio resource contains or what POST body is expected. This is effectively a stub 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'0.02':10,24,123 '000':118 '0x8335':108 '1':158 '20':117 '2913':109 '402':222 '6':127 '89':41 'Base network API' 'USDC pay-per-call' 'accept':96 'access':34,94,141 'actual':204 'advertis':139 'ai/ml':67 'amount':115 'analyt':66 'api':63,93,133,172 'base':8,22,81,111,119 'base-network' 'behind':76 'beyond':239 'bodi':211 'broader':52 'chain':104 'challeng':156,223 'confirm':162,216 'connect':181 'contain':205 'content':187 'contract':107 'correct':219 'data':5,19,65,70,231 'decim':128 'descript':198 'doc':171 'document':166,226 'endpoint':6,20,30,87,214 'equal':122 'exact':160 'exampl':195 'expect':212 'extrem':168 'field':208 'finance/web3':69 'gate':3,17,75 'given':124 'header':153,242 'id':40 'includ':147 'infer':68 'infrastructur':72 'input':236 'instant':143 'key':134 'limit':138 'list':90 'live':163,217 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':114 'micropay':78 'micropayment API' 'network':82 'offer':55 'on-chain':102 'openapi':191 'page':176 'part':49 'pay':9,23,60 'pay-per-request':59 'payment':45,99,145,152,241 'per':11,25,61 'place':129 'platform':53 'portfolio':4,18,38,202 'portfolio API' 'portfolio-data' 'post':97,210 'post-endpoint' 'premium':92 'premium data access' 'price':173 'probe':165 'prompt':183 'protocol':46 'provid':33 'rate':137 'readm':175 'render':178 'request':12,26,62,98 'request/response':194 'requir':135,238 'resourc':39,203 'return':220,233 'schema':192 'scheme':159 'settl':101 'span':64 'spars':169 'specif':37,86 'substant':186 'unclear':229 'unit':120 'usdc':14,28,84,106,125 'usdc-settlement' 'use':83 'util':73 'varieti':57 'version':157 'via':42,105 'wallet':182 'without':225 'x':151 'x-payment':150 'x402':2,16,44,77,155 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8d86d28b-c5c6-456a-abcb-b60be3fab3a0","listingId":"47aab078-904c-4f7c-b6b4-eae930349b7e","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/portfolios/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:39.271Z"}],"sources":[{"listingId":"47aab078-904c-4f7c-b6b4-eae930349b7e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:39.271Z","lastSeenAt":"2026-04-27T14:05:19.385Z"}],"details":{"listingId":"47aab078-904c-4f7c-b6b4-eae930349b7e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/89 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/89"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/89"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving portfolio data for a specific portfolio ID via paid API call","Integrating pay-per-request portfolio lookups into automated trading or analytics pipelines","Agent-driven data retrieval where no API key provisioning is desired"],"bestFor":["Developers wanting keyless, pay-per-call access to portfolio data","AI agents that can settle x402 payments on Base","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.774Z"},"updatedAt":"2026-04-27T14:05:19.385Z"}}